Junos OS (SRX firewalls)
CVE-2026-33787: SRX1500, SRX4100, SRX4200, SRX4600: When a specific show command is executed chassisd crashes
An Improper Check for Unusual or Exceptional Conditions vulnerability in the chassis control daemon (chassisd) of Juniper Networks Junos OS on SRX1500, SRX4100, SRX4200 and SRX4600 allows a local attacker with low privileges to cause a complete Denial of Service (DoS).
Published
Automatic summary from the vendor's CVE record. We haven't written a full analysis of this vulnerability yet.
Affected and fixed versions
| Product / branch | Fixed in |
|---|---|
| Junos OS (SRX1500, SRX4100, SRX4200, SRX4600) 0 | 23.2R2-S6 or later |
| Junos OS (SRX1500, SRX4100, SRX4200, SRX4600) 23.4 | 23.4R2-S7 or later |
| Junos OS (SRX1500, SRX4100, SRX4200, SRX4600) 24.2 | 24.2R2-S2 or later |
| Junos OS (SRX1500, SRX4100, SRX4200, SRX4600) 24.4 | 24.4R2 or later |
| Junos OS (SRX1500, SRX4100, SRX4200, SRX4600) 25.2 | 25.2R1-S1, 25.2R2 or later |
Always confirm against the vendor advisory, which lists every fixed hotfix.
What it is
An Improper Check for Unusual or Exceptional Conditions vulnerability in the chassis control daemon (chassisd) of Juniper Networks Junos OS on SRX1500, SRX4100, SRX4200 and SRX4600 allows a local attacker with low privileges to cause a complete Denial of Service (DoS).
When a specific 'show chassis' CLI command is executed, chassisd crashes and restarts which causes a momentary impact to all traffic until all modules are online again.
This issue affects Junos OS on SRX1500, SRX4100, SRX4200 and SRX4600:
- 23.2 versions before 23.2R2-S6,
- 23.4 versions before 23.4R2-S7
- 24.2 versions before 24.2R2-S2,
- 24.4 versions before 24.4R2,
- 25.2 versions before 25.2R1-S1, 25.2R2.
Workarounds
Use access lists or firewall filters to limit access to the CLI only from trusted hosts and administrators.
Utilize CLI authorization to disallow execution of the 'show chassis' command.
Exploitation
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
Sources
KEV status, EPSS score and vendor data refreshed automatically, last on 13 Oct 2026.